//
//  UIColor+Hex.m
//  imoffice
//
//  Created by zhanghao on 14-9-11.
//  Copyright (c) 2014年 IMO. All rights reserved.
//

#import "UIColor+Hex.h"

@implementation UIColor (Hex)

+ (UIColor *)hexStringToColor:(NSString *)stringToConvert {
    NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

    if ([cString length] < 6)
        return [UIColor blackColor];
    
    if ([cString hasPrefix:@"0X"])
        cString = [cString substringFromIndex:2];
    
    if ([cString hasPrefix:@"#"])
        cString = [cString substringFromIndex:1];
    
    if ([cString length] != 6)
        return [UIColor blackColor];
    
    NSRange range;
    range.location = 0;
    range.length = 2;
    
    NSString *rString = [cString substringWithRange:range];
    range.location = 2;
    
    NSString *gString = [cString substringWithRange:range];
    range.location = 4;
    
    NSString *bString = [cString substringWithRange:range];

    unsigned int r, g, b;
    
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    
    return [UIColor colorWithRed:((float) r / 255.0f)
                           green:((float) g / 255.0f)
                            blue:((float) b / 255.0f)
                           alpha:1.0f];
}

+ (UIColor *)colorWithHexNumber:(NSUInteger)hexColor {
    float r = ((hexColor>>16) & 0xFF) / 255.0f;
    float g = ((hexColor>>8) & 0xFF) / 255.0f;
    float b = (hexColor & 0xFF) / 255.0f;
    return [UIColor colorWithRed:r green:g blue:b alpha:1.0f];
}







// 透明度固定为1，以0x开头的十六进制转换成的颜色
+ (UIColor*) colorWithHex:(long)hexColor;
{
    return [UIColor colorWithHex:hexColor alpha:1.];
}
// 0x开头的十六进制转换成的颜色,透明度可调整
+ (UIColor *)colorWithHex:(long)hexColor alpha:(float)opacity
{
    float red = ((float)((hexColor & 0xFF0000) >> 16))/255.0;
    float green = ((float)((hexColor & 0xFF00) >> 8))/255.0;
    float blue = ((float)(hexColor & 0xFF))/255.0;
    return [UIColor colorWithRed:red green:green blue:blue alpha:opacity];
}
// 颜色转换三：iOS中十六进制的颜色（以#开头）转换为UIColor
+ (UIColor *) colorWithHexString: (NSString *)color
{
    NSString *cString = [[color stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    
    // String should be 6 or 8 characters
    if ([cString length] < 6) {
        return [UIColor clearColor];
    }
    
    // 判断前缀并剪切掉
    if ([cString hasPrefix:@"0X"])
        cString = [cString substringFromIndex:2];
    if ([cString hasPrefix:@"#"])
        cString = [cString substringFromIndex:1];
    if ([cString length] != 6)
        return [UIColor clearColor];
    
    // 从六位数值中找到RGB对应的位数并转换
    NSRange range;
    range.location = 0;
    range.length = 2;
    
    //R、G、B
    NSString *rString = [cString substringWithRange:range];
    
    range.location = 2;
    NSString *gString = [cString substringWithRange:range];
    
    range.location = 4;
    NSString *bString = [cString substringWithRange:range];
    
    // Scan values
    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    
    return [UIColor colorWithRed:((float) r / 255.0f) green:((float) g / 255.0f) blue:((float) b / 255.0f) alpha:1.0f];
}

+ (CAGradientLayer *)setGradualChangingColor:(UIView *)view fromColor:(NSString *)fromHexColorStr toColor:(NSString *)toHexColorStr{
    //    CAGradientLayer类对其绘制渐变背景颜色、填充层的形状(包括圆角)
    CAGradientLayer *gradientLayer = [CAGradientLayer layer];
    gradientLayer.frame = view.bounds;
    //  创建渐变色数组，需要转换为CGColor颜色
    gradientLayer.colors = @[(__bridge id)[UIColor colorWithHex:fromHexColorStr].CGColor,(__bridge id)[UIColor colorWithHex:toHexColorStr].CGColor];
    //  设置渐变颜色方向，左上点为(0,0), 右下点为(1,1)
    gradientLayer.startPoint = CGPointMake(0, 0);
    gradientLayer.endPoint = CGPointMake(1, 1);
    //  设置颜色变化点，取值范围 0.0~1.0
    gradientLayer.locations = @[@0,@1];
    
    return gradientLayer;
}


@end
